572 Coleopterological Notices, IV. 



taut punctures. Abdomen sparsely punctate, strongly convex. Prosternum 

 separating the coxae by barely one-fourth of their width. Length 3.0-3.3 mm. ; 

 width 1.2-1.5 mm. 



Arizona. 



The description is drawn from the female, the only sex which I 

 have seen. The extraordinary development of the antennal club 

 and shorter beak will at once distinguish the present species from 

 crotchi. Two specimens. 



CEIVTRINUS. 



Schonherr — Curcul. Disp. Meth., p. 308. 



Within the wide limits permitted by the short and somewhat 

 ambiguous definition of Schonherr, I here regard as Oentrinus, 

 those species of Barini which have the pygidium concealed in both 

 sexes, or never with more than the mere tip exposed, the femora 

 unarmed, the mandibles elongate, prominent, not in the least decus- 

 sate when closed, with the inner edge entirely free from notches 

 and denticulation, and the tarsal claws free and divergent. In 

 addition, it should be stated that the species are, with very few ex- 

 ceptions, rhomboidal or rhomboid-oval to a greater or less degree, 

 and are all more or less squamose. This definition, also, will at 

 least not exclude those species defined as Centrinus by Pascoe 

 (Ann. Mag. Nat. Hist., Oct. 1889, p. 322) viz: "Claws free; 

 canal nearly obsolete or absent ; anterior coxae separated ; proster- 

 num lower than the coxae ; elytra broader than the prothorax." 



With these characters are associated others, even in our own 

 somewhat limited fauna, of considerable variety. The beak may 

 be very slender, comparatively robust, or slender and inflated near 

 the base, strongly and evenly or feebly and unevenly arcuate and 

 variously compressed and flattened, the antennae inserted beyond 

 or behind the middle and the prothorax tubulate or not. The ante- 

 rior coxae may be narrowly or quite widely separated, the prosternum 

 flat or variously impressed, foveate or sulcate, often very differently 

 modified in these respects in the sexes of the same species. Finally, 

 the secondary sexual modification of the male may be radically dif- 

 ferent in kind, consisting either of short or long ante-coxal corneous 

 processes of the prosternum, or of a dentiform extension of the 

 anterior trochanters, or of a short erect tooth-like process projecting 

 from the inner side of the basal joint of the antennal club, never, 

 however, by a combination of any of these three modifications; in 



